Tube for pneumatic tires.



A. E. HENDERSON.

TUBE FOR PNEUMATIC TIRES.

APPLICATION mu) MAR. 1. 1914.

Patented Mar. 21, 1916.

UNITED STATES PATENT OFFICE.

ALBERT ENNIS HENDERSON, OF TORONTO, ONTARIO, CANADA, ASSIGNOR TOSUPERIOR TUBES AND ACCESSORIES, LIMITED, A CORPORATION OF CANADA.

TUBE FOR PNEUMATIC TIRES.

Specification of Letters Patent.

Patented Mar. 21 1916.

Application filed March 7, 1914. Serial No. 823,182.

To all whom it may concern:

Be it known that I, ALBERT ENNIS HEN- onRsoN, subject of the King ofGreat Britairi ,,rand resident of the city of Toronto, ctiitfity ofYork, Province of Ontario, 1n th Dominion of Canada, have inventedcertain new and useful Improvements in Tubes for Pneumatic Tires, and dohereby declare that the following is a full, clear, and exactdescription of the same, such as will enable others skilled in the artto which it appertain's to make and use the same.

My invention relates to improvements in tubes for pneumatic tires inwhich the tread of the tube is thickened and held in compression so asto render the same proof against puncture. And the objects of myinvention are,-1st, to provide a puncture proof tube which, while havingthe tread held in compression, yet, owing to the pe culiar constructionof the same, any necessary longitudinal or lateral elasticity isprovided for. 2nd, to construct a tube which will be proof againstblow-out, without destroying the necessary elasticity of the tube.

In the drawings Figure 1 is a perspective view of a portion of thecompleted tube with parts broken away. Fig. 2 is a plan view withportions broken away indicating the relation of the component parts.Fig. 3 is a sectional view of the tube showing the transverse relationof the fabric and also the thickened tread. Fig. 4 is a similarsectional view showing the construction of the tube at the valve seat.Fig. 5 is a modified form shown in cross-section indicating thelongitudinal overlapping flanges opposite to the thickened treadportion.

Like numerals of reference indicate corresponding parts in each figure.

1 is an air tube for, pneumatic tires having a thickened tread portion 2gradually reducing in thickness as it extends laterally from thelongitudinal center of the said tread around the sides of the tube.Adja' cent to the ultimate tread surface of the tube and embedded in thesaid tube a suitable distance from its surface is the series 3 of fabricstrips extending longitudinally in the said tread. said strips beingseparated longitudinally by suitable intervals 18 of unrestrainedrubber. In approximately the same cross-sectional circumferential planeas the strips 3, and extending longitudinally around the said tube. aresimilar series of strips also marked 3 having correspondmg strips on theopposite side of the tube, said strips being separated by a narrowlongitudinal portion of unrestrained rubber 1.8, and extendinglaterallyareund the sides of the tube partially protecting such portionof the tube as would be liable to blow out through injury to the casing.These series of strips also consist of segments separated longitudinallyby a portion of unrestrained rubber 18, said portion being in each casepreferably in a different cross-sectional plane, thus staggering theunrestrained portions 18.

At a suitable distance from the ultimate exterior surface of thefinished tube are series of strips 4, having portions of unrestrainedrubber 19 and 19 to permit longitudinal and lateral expansion of thesame, said strips being embedded in such manner that they overlap bothlongitudinally and laterally all the strips of the series 3, thusrestraining the too free action of the unrestrained portions of rubberin the series 3, and together with the series 3 completely protectingthe portion of the tube exposed to blow-out.

In Fig. 1 a portion of the tube has been broken away showing in sectionthe longitudinal overlapping relation of the series of strips 3 and 4cin the tread portion of the tube. The staggered position of the strips 3and 4 on the sides of the tube are also shown in dotted lines in thesame figure.

In Fig. 2 a portion of the outer layer of rubber is broken away, showingthe position of the outer series of strips 3 in their relation to eachother. The layer of rubber 3 lying between the series 3 and 4 is thenbroken away, showing the relation of the strips of the series 4 to eachother and to the series 3. The thickened portion of the tread is thenshown broken away, said tread being held in compression by the series offabric strips 3 and 4 embedded in said tread.

Figs. 3, 4 and 5 also show in detail the cross-sectional overlap of thefabric strips of the outer series 3 and the inner series 4'.

In Fig. 1 is shown the method in detail of joining the two ends of thetube. The strips of canvas 11. come to the surface of the tube as shownat 11 and extend beyond the ends of the tube. A portion of each stripbeing cut away, the remaining portions lap over and engage the surfaceof the tube, holding firmly together the abutting ends of the tube atthe point 10. Exteriorly applied to the tube and covering the saidfabric is the thin rubber sheet 12, which has been broken away to showthe overlapping relation of the strips. Similarly applied within thetube is the strip 13 which further strengthens the joint.

The tube may be constructed in the usual Way, vulcanized on a circularor otherwise shaped form, and may be joined at the ends as shown in Fig.1 or may have a circumferential unbroken tread with an annular joint 9with overlapping flanges 9 and 9 opposite to the same as shown in Fig.5.

Upon the tube being reversed and inflated longitudinal and lateralcompression of the tread will be produced, and'owing to the longitudinaland lateral overlapping of the fabric strips a more elastic constructionwill be provided Without destroying the necessary compression, while theportion of the tube exposed to puncture or blow-out is protected by oneor other of the series of fabric strips, thus eliminating thepossibility of blow-out of the inner tube.

It must be understood I do not confine myself to the exact constructionas shown, particularly as regards the relation of the various strips offabric to each other, as the construction may be varied Withoutdeparting from the spirit of my invention.

What I claim, as new, is

1. An inner tube for pneumatic tires, having a thickened tread portionand having embedded within and with rubber interposed a plurality oflongitudinally and laterally overlapped fabric strips, said stripsholding the tread portion in compression.

2. An inner tube for pneumatic tires, having a thickened tread portionand having embedded in the tread portion and also as a protectionagainst blow outs through the sides of the tube a plurality oflongitudinally and laterally overlapped fabric strips, said strips inthe tread portion holding the tread portion in compression.

3. An inner tube for pneumatic tires, having a thickened tread portionand having embedded within the body of the tube a plurality oflongitudinally and laterally overlapped fabric strips, the strips in thetread portion holding the tread portion in compresslon. I

p 4. An inner tube for pneumatic tires, having a thickened tread portionand having embedded within the tube adjacent the outer surface thereof aplurality of longitudinally and laterally overlapped fabric strips, saidstrips holding the tread portion in compres- SlOIl.

5. An inner tube for pneumatic tires, having a thickened tread portion,superposed alternating series of fabric strips embedded in the tube withrubber interposed, the strips being out of contact with one another andholding the tread portion in compression.

6. A tube for pneumatic tires, having a thickened tread portion held incompression by means of overlapped fabric strips longitudinally embeddedin the tube, said strips being arranged in superposed series and thosein the same plane being separated by portions of unrestrained rubber topermit longitudinal and transverse expansion of the tube.

7. A tube for pneumatic tires, having a thickened tread, said treadbeing held in compression and the tube also protecied' from blowout bymeans of transversely and longitudinally overlapped fabric strips, andthose strips in the same plane being separated by unrestrained rubber topermit longitudinal and lateral transverse expansion of the tube.

8. A tube for pneumatic tires, having a thickened tread and also havingan abutting joint strengthened by means of overlapping portions of anouter series of fabric strips extending beyond the joint, and means forprotecting the overlapped projecting strips.

9. A tube for pneumatic tires having a thickened tread portion held incompresslon and its side walls protected against blow out by overlappingstrips of flexible inelastic material, said tube being permittedlongitudinal and transverse extension.

In testimony whereof I have hereunto aflixed my signature in thepresence of two Witnesses.

ALBERT ENNIS HENDERSON.

Witnesses:

J. L. ATKINSON, A. KEMISH.

